[saltynacho]

I have a 1981 gl 500 that I am slowly but surely converting to a cafe racer. The first change I made was swapping the hulking factory airbox for a pair of KnN pod filters. I noticed nigh immediately that the bike was bogging down at all RPM levels. a friend told me that they were introducing far too much air to combustion for proper reliable power. to solve this I ended up covering a good half-to-three quarters of the filters with duct tape, and covered about half of the carburetor openings to restrict the excess airflow. Abra-Cadabra! it worked and I am now zipping around town like I stole the bike.



-one major problem-



She tops out at 50-55 mph, in 4th or 5th, so I am basically stuck here in town. no highways, no interstates, no go-baby-go. she literally will not go faster than 55. can anyone PLEASE help me here because I think I used up all of this years luck on the last shot in the dark fix...

 

[marnargulus]

You need to rejet, or have a way of adjusting the amount of tape as you ride.

 

[marnargulus]

I've been looking into diaphragm valves for just this reason BTW. They adjust like the diaphragm of a camara as you focus. (Think james bond opening scenes)